{
  "cveId": "CVE-2024-49940",
  "url": "https://patchblox.com/security/cve/CVE-2024-49940",
  "summary": "CVE-2024-49940 is fixed in 26 products on 1 platform, first by DEBIAN-CVE-2024-49940, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "l2tp: prevent possible tunnel refcount underflow",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  l2tp: prevent possible tunnel refcount underflow  When a session is created, it sets a backpointer to its tunnel. When the session refcount drops to 0, l2tp_session_free drops the tunnel refcount if session-\u003Etunnel is non-NULL. However, session-\u003Etunnel is set in l2tp_session_create, before the tunnel refcount is incremented by l2tp_session_register, which leaves a small window where session-\u003Etunnel is non-NULL when the tunnel refcount hasn\u0027t been bumped.  Moving the assignment to l2tp_session_register is trivial but l2tp_session_create calls l2tp_session_set_header_len which uses session-\u003Etunnel to get the tunnel\u0027s encap. Add an encap arg to l2tp_session_set_header_len to avoid using session-\u003Etunnel.  If l2tpv3 sessions have colliding IDs, it is possible for l2tp_v3_session_get to race with l2tp_session_register and fetch a session which doesn\u0027t yet have session-\u003Etunnel set. Add a check for this case.",
  "published": "2024-10-21T18:15:15Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00325,
  "epssPercentile": 0.25687,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49940",
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  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
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}